CurtPalme.com Home Theater Forum

**Curt Palme** · Posted: Wed Jun 04, 2008 1:06 am Post subject:

Actually, looking at this again: Is there any chance that some strong sunlight hit the lens? It almost looks like that C element is melted. Run your fingers over it.

If so, the tubes will still need to go to VDC, but seeing that ring around the middle of the set screams of sunlight coming into the tube. The C element is plastic, andwill melt within a couple of seconds of sunlight hitting the lens.

Mike__P · Joined: 18 Mar 2008 Posts: 22

No sunlight as this is a completely enclosed theater. I did bring some halogen shop lights into the theater to remove the boards, but the tubes looked like this before then.

Tim in Phoenix · Joined: 21 Oct 2006 Posts: 4409 Location: Phoenix

Hello

If that is glycol contamination, it must be the Andromeda Strain type, to have crept in there in weeks.

.

Mike__P · Joined: 18 Mar 2008 Posts: 22

Seriously, any other ideas?

Zebu Fellenz · Joined: 21 Dec 2006 Posts: 2567

I wouldn't think fungus could appear in only two weeks but it is a possibility. Until you pull one of the tubes apart you will not know for sure.

draganm · Joined: 08 Mar 2006 Posts: 8990 Location: Colorado

I thought i knew a little something about CRT but i've never seen anything like that before posted on AVS or here? the closest thing was from tubes that were broken at the neck and the vacuum imploded the debris it into the Phosphor face. Of course those tubes didn't have any output after that so obviosuly not the case here. Could this be a failure of the LVPS filament voltage. Like a short across the trim pot and full 12 volts at the gun?

**Curt Palme** · Posted: Wed Jun 04, 2008 5:14 pm Post subject:

Well I'm glad I'm not the only one that hasn't seen this.. Smile

Mike, it should be pretty easy to tell if this is witin the cooling chamber or not. I'm guessing that you can sort of look 'behind' the C element. I believe you'll find that the image on the tube face itself is clean, but that either the C element is bad or the cooling fluid (glycol) is contaminated. Why it did this in a short period of time is completely beyond me.

Mike__P · Joined: 18 Mar 2008 Posts: 22

Well I am sure glad to run into somehting no one else has seen. Laughing

Like I was telling Curt via PM, this is not my projector and I think I am officially over my head. I talked to a local home theater company that gave me the number of a tech in town that is one of the few that still does work on crts. I am going to call them and see if they can repair it. If not at the very least we'll have them dismantle the tube assemblies so they can be sent to vdc.

Back to Curt's question, the c element seems smooth and up close and the glycol even looks clear. I wonder if for some reason the c-element is shot.

The picture was really nice for the 60 minutues I had full HD through a properly converged image. Rolling Eyes

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

I'm wondering if this could of been caused by a laser pointer. Anybody in that house including any kids have one?

Mike__P · Joined: 18 Mar 2008 Posts: 22

no laser pointers as far as I know; just a guy and his wife and a few dogs.

**Curt Palme** · Posted: Thu Jun 05, 2008 8:34 pm Post subject:

There is another option that you might consider. the 9000 is getting a bit long in the tooth now. you might consider sending it up, I'll repair everything on it tube-wise, but transfer the tubes over to an 8500 chassis that overall will be about 4 years newer with better circuits in it. To save weight, you could take the lenses off before shipping.

Talk to the service company, but I'll bet they'll charge an arm and leg..

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

I looked at the pics again and hasn't any one noticed the grids are either doubled up or in some spots broken. Id be more intrested about that , Looks like a scan problem. I never seen a grid just not connected like that before. The blue in the first pic has a double grid and the red has the grid broken in some spots.

what would cause that?

Athanasios

Mike__P · Joined: 18 Mar 2008 Posts: 22

Well I can't be sure because I am not in front of the projector, but I think the double lines are from my shaky hands at the top of a ten foot ladder with a crappy cell phone camera.

@Curt - I will pass that along as an option. Send me a pm so I have an general idea of the cost involved. For shipping would we use an ltl carrier? I can only imagine how much ups would charge for an item that big!

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

That explain the blue grid issue but not the broken grid on the red.

Athanasios

Mike__P · Joined: 18 Mar 2008 Posts: 22

I may be back over there in the next few days. If so, I'll take some high quality photos with my d-slr. Bottom line is this projector has serious issues in the blue and red tubes.

Thanks,

Mike

Mike__P · Joined: 18 Mar 2008 Posts: 22

Oh and btw, this forum ROCKS. I appreciate all of the help everyone has offered.

stefuel · Posted: Wed Jun 11, 2008 11:04 am Post subject:

I'm going to ask a really friggin stupid question or two. First, how long has the owner of this projector had it in operation? Second, has anyone even confirmed that there IS coolant in these tubes? Why??? to me, it looks like the c-elements are cooked from the rear. The center of the c-element is real close to the tube face and are only plastic.

Chip

David_Web · Joined: 02 May 2007 Posts: 418 Location: Sweden

It looks kind of dry in the red picture.
I thought the distortion looked ok on the blue but I don't know. Comparing it to the pictures in the C-element changing guide it does look empty. But it could be the camera angle as well.

Mike__P · Joined: 18 Mar 2008 Posts: 22

draganm · Joined: 08 Mar 2006 Posts: 8990 Location: Colorado